Messier 68
| Messier 68 | |
|---|---|
 | |
| Data pengamatan (J2000 epos) | |
| Kelas | X[1] |
| Rasi bintang | Hydra |
| Asensio rekta | 12j 39m 27.98d[2] |
| Deklinasi | –26° 44′ 38.6″[2] |
| Jarak | 336 kly (103 kpc)[3] |
| Magnitudo tampak (V) | +9.67[4] |
| Dimensi tampak (V) | 11′.0 |
| Karakteristik fisik | |
| Massa | 2,23×105[3] M☉ |
| Radius | 53 tc[5] |
| Metalisitas | = –2.23[3] dex |
| Perkiraan umur | 11.2 Gyr[6] |
| Fitur penting | Relatively metal poor.[3] |
| Nama lain | M68, NGC 4590, GCl 20, C 1236-264, ESO 506-SC030[4] |
![{\displaystyle {\begin{smallmatrix}\left[{\mathrm {Fe} }/{\mathrm {H} }\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
Messier 68 (juga dikenal M68 atau NGC 4590) adalah sebuah gugus bola yang terletak pada rasi bintang Hydra. M68 ditemukan oleh Charles Messier pada tahun 1780. M68 berada pada jarak sekitar 33.000 tahun cahaya dari Bumi.
Referensi
- ^ Shapley, Harlow; Sawyer, Helen B. (1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin (849): 11–14, Bibcode:1927BHarO.849...11S
- ^ a b Goldsbury, Ryan; et al. (2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830–1837, arXiv:1008.2755, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830.
- ^ a b c d Boyles, J.; et al. (2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, arXiv:1108.4402, Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51.
- ^ a b "SIMBAD Astronomical Database". Results for NGC 4590. Diakses tanggal 2006-11-17.
- ^ distance × sin( diameter_angle / 2 ) = 53 ly. radius
- ^ Sollima, A.; et al. (2008), "The correlation between blue straggler and binary fractions in the core of Galactic globular clusters", Astronomy and Astrophysics, 481 (3): 701–704, arXiv:0801.4511, Bibcode:2008A&A...481..701S, doi:10.1051/0004-6361:20079082
Pranala luar
- Globular Cluster M68 @ SEDS Messier pages Diarsipkan 2011-08-15 di Wayback Machine.
- Messier 68, Galactic Globular Clusters Database page
- Messier 68 di WikiSky: DSS2, SDSS, GALEX, IRAS, Hidrogen α, X-Ray, Astrophoto, Peta langit, Artikel dan gambar
Koordinat: 
12h 39m 28.01s, −26° 44′ 34.9″
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